package eightDataType.mStr;

/**
 * @author macpro
 * @date 2019-07-09
 * @function
 */
public class StringLowerUpperCase {
    public static void main(String[] args) {
        String str = "abc DEF 123";
        String lower = str.toLowerCase();
        System.out.println("lower "+lower);
        String upperCase = lower.toUpperCase();
        System.out.println("up "+upperCase);
        System.out.println("13112719890823001X".length());
    }
}
